Syntheses, characterization and structures of CpFe(CO)( μ-I)( μ-dppm)M(CO) 4 (M=Cr, Mo, W)

Abstract

Reaction of CpFe(CO)I( η 1-dppm) with M(CO) 4(L) 2 (L=acetonitrile or norbornadiene) affords the heterobimetallic complexes CpFe(CO)( μ-I)( μ-dppm)M(CO) 4 ( 1, 2 and 3 for M=Cr, Mo and W, respectively). These new complexes have been characterized by elemental analyses and IR, mass, 1H and 31P NMR spectroscopies. The crystal structures of 1 and 3 reveal that the two heterometal atoms are not bonded but are bridged by a dppm and an iodide ligands. Compound 1 crystallizes in a space group P2 1/ c with a=10.664(3) Å, b=15.495(4) Å, c=20.494(3) Å, β=92.37(2)°, V=3383(1) Å 3, Z=4 and R/ R F =0.058/0.050. Compound 3 crystallizes in a space group P2 1/ c with a=10.668(2) Å, b=15.567(2) Å, c=20.512(2) Å, β=92.65(1)°, V=3402.7(8)Å 3, Z=4 and R/ R F =0.048/0.066.